ghostang
Well-Known Member
Thank you for the information! I took my 2018 Mustang GT into the dealership and noted the TSB. The weird thing is the service paperwork reports they "performed TSB 21-2357, reset transmission table, reprogrammed transmission characteristics, and performed adaptive relearn road test." That seems to match the description of TSB 21-2315 but I could not find TSB 21-2357 anywhere. Nonetheless, the car is shifting much better. I saw a post on the F-150 forum about TSB 21-2357. Anyone else seen TSB 21-2357?Newest 10R80 TSB 21-2315 just released Sept. 28, 2021 related to Harsh/Delayed shifts
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